The pair were due to perform together earlier this year (04) - but Knowles
didn't want to be associated with Jackson following her controversial
appearance at the Super Bowl in February, at which she accidentally exposed her
bare breast.

A source says, "Beyonce pulled out of a duet with Janet after the Super
Bowl nipple fiasco. Janet was very hurt by the move.

"But Beyonce then contacted her, asking if Destiny's Child could use her
vocals on their album."